package com.hzlh.common;

import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.Random;
import java.util.UUID;

public class RandomCodeGenerator {
    /**
     * 按类型生成
     * @param source
     * @return
     */
    public static String getCustomerId(String source) {
        String date = LocalDate.now().format(DateTimeFormatter.ofPattern("yyyyMMdd"));
        StringBuilder codeNum = new StringBuilder();
        Random random = new Random();
        for (int i = 0; i < 6; i++) {
            switch (random.nextInt(3)) {
                case 0:
                    codeNum.append(random.nextInt(10));
                    break;
                case 1:
                    codeNum.append((char) (random.nextInt(26) + 65));
                    break;
                case 2:
                    codeNum.append((char) (random.nextInt(26) + 97));
                    break;
                default:
                    break;
            }
        }
        return source + date + codeNum.toString();
    }


    public static String[] chars = new String[] { "a", "b", "c", "d", "e", "f",
            "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s",
            "t", "u", "v", "w", "x", "y", "z", "0", "1", "2", "3", "4", "5",
            "6", "7", "8", "9", "A", "B", "C", "D", "E", "F", "G", "H", "I",
            "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V",
            "W", "X", "Y", "Z" };


    public static String generateShortUuid() {
        StringBuffer shortBuffer = new StringBuffer();
        String uuid = UUID.randomUUID().toString().replace("-", "");
        for (int i = 0; i < 8; i++) {
            String str = uuid.substring(i * 4, i * 4 + 4);
            int x = Integer.parseInt(str, 16);
            shortBuffer.append(chars[x % 0x3E]);
        }
        return shortBuffer.toString();

    }
}
